Browse Prior Art Database

AUTOMATIC MOTOR CONTROL

IP.com Disclosure Number: IPCOM000006344D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2001-Dec-26
Document File: 2 page(s) / 84K

Publishing Venue

Motorola

Related People

Alfred N. Danial: AUTHOR [+2]

Abstract

This invention was formulated with the intent of improving vibrator motor performance in both the factory and the field. The vibrator motors, which are sold in the majority of the paging products, have a wide variation in speed. This invention is designed to minimize or eliminate the variance in motor speed, and simplify factory tests.

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MOTOROLA INC. Technical Developments Volume 14 December 1991

AUTOMATIC MOTOR CONTROL

by Alfred N. Danial and Craig S. Monroe

  This invention was formulated with the intent of improving vibrator motor performance in both the factory and the field. The vibrator motors, which are sold in the majority of the paging products, have a wide variation in speed. This invention is designed to minimize or eliminate the variance in motor speed, and simplify factory tests.

  The invention consists of adding closed loop control circuitry (Figure 1) to the decoder board of the pager, such that the speed of the motor can be digitally controlled and displayed on the LCD of display pagers. An internal fre- quency counter would pick up the spike signals of the brushes making and breaking contact with the commuta- tor. This would then be provided to the microprocessor which would check to see ifit is within the correct operat- ing limits. Ifthe frequency is off, the microprocessor would change the speed of the motor accordingly by adjusting the voltage going to it. The monitoring of the motor speed by the frequency could also be provided to the LCD display of a pager, so that an individual, or a vision com- puter system could read the information directly.

  The acceptable motor speed limits would be pro- grammed into the pager along with the rest of the programmable data. The pager could then do a self test of the motor, and display either a "VIB PASS" or "VIB FAIL" on t$LCD, depending whether or not the pager could keep the speed of the motor between...